Arrangement for pressure-controlled quantity regulation in air ventilation installations



1962 THORE-KRISTIAN MYHRE 3,058,491

ARRANGEMENT ,FOR PRESSURE-CONTROLLED QUANTITY REGULATION IN AIR VENTILATION INSTALLATIONS Filed Oct. 19, 1959 1 j g -:a A 1*"? Q 1 E v 4 Q 1 #1:: Q I d 5 :Q --::a

Q A .A, 5; i! a i INVENTQR THORE KRISTIAN MYHRE ATTORNEYS A 3,058,4. Patented Oct. 16, 1962 3,058,491 ARRANGEMENT FOR PRESSURE-CONTROLLED QUANTITY REGULATION IN AIR VENTILA- TION INSTALLATIONS Thore-Kristian Myhre, General Birchsgate 30, Oslo, Norway Filed Oct. 19, 1959, Ser. No. 847,291 Claims priority, application Norway Oct. 21, 1958 2 Claims. (Cl. 13841) The present invention relates to an arrangement for control of air quantities supplied by air ventilation installations, especially installations where several, separate rooms are supplied with air from a common source of compressed air.

In an installation of the above mentioned type unbalance will occur if the pressure prevailing in any one of the rooms suddenly drops, e.g. because doors or windows thereof are opened. If this happens a disproportional great portion of the air is supplied to the roomin which low pressure occurs, and the other rooms of the installation are supplied with less air than calculated.

The object of the present invention is to provide a simple and cheap control for installations of above defined type.

According to the invention this aim is obtained thereby that the air path is blocked by a porous material which by increasing air pressure is compressed against a perforate staying member, so that the pore openings of the porous material become constricted and the resistance to the penetration of the air through said material increases. Thus, if the pressure difierence between the pressure source and the room to be supplied with air increases, the porous material is compressed and decreases the supply of air to the room in question in desired manner. By suitable choice of the thickness and penetration properties of the porous material it is possible to secure an approximately uniform admission of air to the several rooms connected in an installation of the defined type, independent of the pressure prevailing in each room.

In addition to the advantages mentioned above there is obtained dampening of sounds, which may accompany the air stream due to the shape of the air channel, since such sounds are absorbed by the porous material. Moreover a certain filtering action is obtained.

An embodiment of the invention is described below with reference to the annexed drawing.

FIGURE 1 illustrates a section taken through a device of the invention.

FIGURE 2 shows a section taken along the line IIII on FIGURE 1.

FIG. 3A shows an uncompressed section of the porous material.

FiG. 3B shows a section of the porous material compressed by an increase in the difference between the ordinary ventilating air pressure on one side of it and the ordinary air pressure on the other side of it.

The drawing shows a usual air inlet valve 1, provided with ribs 2, 3, which guide the air current; and which is placed in a wall of a room connected with the ventilation installation. To the valve 1 is admitted ventilating air under pressure through a channel 4. At the pressure side, in front of the guide ribs 2, is provided a staying organ 5 provided with perforations or openings, which organ may consist of wire gauze, wire netting, expanded metal or the like. Said staying organ also may consist of the porous material itself it the material itself is of a sufficiently staying nature. In order to increase the surf-ace area of this stay member it may have the form of two roof surfaces enclosing between them an angle cc. Said angle on may have any desired value, subject to the desired surface of area. At the pressure side of the member 5, or upstream with respect to the flow of ventilating air through channel 4, is provided a porous material 6 through which the ventilating air flows. The porous material 6 may consist of e.g. foam plastics, foam rubber, a porous mass of felt, or the like, placed in one or several layers, all in accordance with the penetration resistance which it is desired to obtain. By correct choice of surface area, thickness and porous properties of the material 6 the desired control of the amount of air supplied to the room is obtained even if the pressures at each side of the porous material varies. The normal condition of the porous material 6 is shown in FIG. 3A, and the compressed condition of the porous material is shown in FIG. 3B. If the pressure difference between the ordinary ventilating air pressure in channel 4 and the ordinary air pressure in the room applied with the ventilating air increases, the increase in pressure will at least partially compress the porous material as shown in FIG. 3B. This decreases the size of the pore openings in the porous material, which restricts the flow of ventilating air through the porous material to the room, thus automatically controlling the flow of ventilating air to the room.

I claim:

1. In an air ventilating installation including an air channel in which ventilating air under pressure is supplied to a room to be ventilated, a perforated stay mounted in the channel and extending across the flow area thereof and through which the ventilating air in the channel must flow, and a covering of an air-flow-controlling porous material covering the pressure side of the stay and through which the ventilating air flowing in the channel to the room must flow, the covering of porous material on the stay having constrictible pore openings for the flow of ventilating air therethrough and being compressible in response to an increase in the difierence between the ordinary ventilating air pressure in the channel on the pressure side of the covering of porous material and the ordinary air pressure in the room, and said covering of porous material on the stay having a structure such that the pore openings therein are constricted and the ventilating air flow therethrough reduced when the covering of porous material is compressed.

2. In an air ventilating installation including an air channel in which ventilating .air under pressure is supplied to a room to be ventilated, a perforated stay mounted in the channel and extending across the flow area thereof and through which the ventilating air in the channel must flow, and a layer of an air-flow-controlling porous material covering the pressure side of the stay and through which the ventilating air flowing in the channel to the room must flow, the layer of porous material 0n the stay having constrictible pore openings for the flow of ventilating air therethrough and being compressible in response to an increase in the difierence between the ordinary ventilating air pressure in the channel on the pressure side of the layer of porous material and the ordinary air pressure in the room, and said layer of porous material on the stay having a structure such 7 3 4 that the pore openings therein are constricted and the 1,232,456 Bliss July 3, 1917 ventilating air flow therethrough reduced when the layer 1,572,469 De Lin Feb. 9, 1926 of porous material is compressed. 1,896,700 Cross Feb. 7, 1933 2,081,553 Neeson May 25, 1937 References Cited in the file of this patent 5 2,611 8215 PM Nov. 18 1952 UNITED STATES PATENTS 2,936,854 Lucas May 17, 1960 1,121,700 Wiedmann Dec. 22, 1914 2,991,843 Bell y 1 1961 1,216,685 Harding Feb. 20, 19 17 

